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Question

(13+313)13= ______


A

65

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B

16

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C

11

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D

18

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Solution

The correct option is A

16


We know that,
(x+y)z=x+(yz), for all numbers x, y, z with y>z.

Since the above is true for all the numbers, it must be true for
x=13, y=313 and z=13 also, as
y=313>13=z

So, (13+313)13
=13+(31313)
=13+3=16


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